我创建了一个特定布局的pdf。问题是当文本视图的内容非常长时，pdf不会自动生成新页面，并且我无法预定义在运行时将创建多少页。请问有人能帮我吗？
在iPad上直接从UiTextView创建多页PDF
3
- Chaitali Jain
2
1首先欢迎，你尝试了什么？ - iPatel
你试过这样做了吗？你完成了吗？ - 08442
3个回答
2
您可以尝试使用以下代码，这可能会对您有所帮助。 在界面构建器中保留一个文本视图和一个按钮，并使用按钮操作方法并生成PDF。 导入这些框架。
#import <QuartzCore/QuartzCore.h>
#import <CoreText/CoreText.h>
-(NSString*)getPDFFileName
{
NSString* fileName = @"sample.PDF";
NSArray *arrayPaths =
NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory,
NSUserDomainMask,
YES);
NSString *path = [arrayPaths objectAtIndex:0];
NSString* pdfFileName = [path stringByAppendingPathComponent:fileName];
return pdfFileName;
}
-(IBAction)PdfGeneration:(id)sender{
// Prepare the text using a Core Text Framesetter.
CFAttributedStringRef currentText = CFAttributedStringCreate(NULL, (__bridge CFStringRef)txtObj.text, NULL);
if (currentText) {
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString(currentText);
if (framesetter) {
NSString *pdfFileName = [self getPDFFileName];
// Create the PDF context using the default page size of 612 x 792.
UIGraphicsBeginPDFContextToFile(pdfFileName, CGRectZero, nil);
CFRange currentRange = CFRangeMake(0, 0);
NSInteger currentPage = 0;
BOOL done = NO;
do {
UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, 612, 792), nil);
currentPage++;
[self drawPageNumber:currentPage];
currentRange = [self renderPage:currentPage withTextRange:currentRange andFramesetter:framesetter];
if (currentRange.location == CFAttributedStringGetLength((CFAttributedStringRef)currentText))
done = YES;
} while (!done);
UIGraphicsEndPDFContext();
CFRelease(framesetter);
} else {
NSLog(@"Could not create the framesetter needed to lay out the atrributed string.");
}
// Release the attributed string.
CFRelease(currentText);
} else {
NSLog(@"Could not create the attributed string for the framesetter");
}
}
// Use Core Text to draw the text in a frame on the page.
- (CFRange)renderPage:(NSInteger)pageNum withTextRange:(CFRange)currentRange
andFramesetter:(CTFramesetterRef)framesetter
{
// Get the graphics context.
CGContextRef currentContext = UIGraphicsGetCurrentContext();
CGContextSetTextMatrix(currentContext, CGAffineTransformIdentity);
CGRect frameRect = CGRectMake(72, 72, 468, 648);
CGMutablePathRef framePath = CGPathCreateMutable();
CGPathAddRect(framePath, NULL, frameRect);
CTFrameRef frameRef = CTFramesetterCreateFrame(framesetter, currentRange, framePath, NULL);
CGPathRelease(framePath);
CGContextTranslateCTM(currentContext, 0, 792);
CGContextScaleCTM(currentContext, 1.0, -1.0);
CTFrameDraw(frameRef, currentContext);
currentRange = CTFrameGetVisibleStringRange(frameRef);
currentRange.location += currentRange.length;
currentRange.length = 0;
CFRelease(frameRef);
return currentRange;
}
- (void)drawPageNumber:(NSInteger)pageNum
{
NSString *pageString = [NSString stringWithFormat:@"Page %d", pageNum];
UIFont *theFont = [UIFont systemFontOfSize:12];
CGSize maxSize = CGSizeMake(612, 72);
CGSize pageStringSize = [pageString sizeWithFont:theFont constrainedToSize:maxSize lineBreakMode:UILineBreakModeClip];
CGRect stringRect = CGRectMake(((612.0 - pageStringSize.width) / 2.0),720.0 + ((72.0 - pageStringSize.height) / 2.0),pageStringSize.width,pageStringSize.height);
[pageString drawInRect:stringRect withFont:theFont];
}
- 08442
1
谢谢您的回复。这会根据textView中字符串的长度生成多页PDF文件吗？ - Chaitali Jain
0
很多用户正在寻找此代码以使其与Swift版本兼容。因此，这里提供了适用于Swift 4和5的代码。
// PDF名称并在本地路径上生成：
func writeToPDF(filenameStr:String)
{
pageSize = CGSize.init(width: 768, height: 10000)
// let fileName: NSString = "test.pdf"
let fileName = String.init(format: "%@.pdf", filenameStr)
let documentDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first!
let pdfPathWithFileName = documentDirectory.appending("/" + fileName)// documentDirectory.appending(fileName as String)
self.PdfGeneration(filePath: pdfPathWithFileName)
//lines written to get the document directory path for the generated pdf file.
if let documentsPath = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first?.path {
print("documentsPath",documentsPath)
// “var/folder/…/documents ” copy the full path
}
}
// 生成PDF文件以显示文本和图片的方法。
func PdfGeneration(filePath: String)
{
// Prepare the text using a Core Text Framesetter.
//CFAttributedStringRef currentText = CFAttributedStringCreate(NULL, (__bridge CFStringRef)txtObj.text, NULL);
let currentText = CFAttributedStringCreate(nil, (self.textVW_file.text as? CFString?)!, nil)
if(currentText != nil)
{
let framesetter = CTFramesetterCreateWithAttributedString(currentText!)
if (framesetter != nil) {
UIGraphicsBeginPDFContextToFile(filePath, .zero, nil)
var currentRange = CFRangeMake(0, 0)
var currentPage = 0
var done = false
repeat {
repeat {
UIGraphicsBeginPDFPageWithInfo(CGRect.init(x:0, y:0, width:612, height:792), nil)
currentPage = currentPage + 1
self.drawPageNumber(currentPage)
currentRange = self.renderPage(currentPage, withTextRange: currentRange, andFramesetter: framesetter)
let aText:CFAttributedString = currentText!
print("currentText %@",currentText!)
print("currentRange.location %@ and %@",currentRange.location,CFAttributedStringGetLength(aText))
if (currentRange.location == CFAttributedStringGetLength(aText)) {
done = true
}
}while (!done)
UIGraphicsEndPDFContext()
}
else
{
print("Could not create the framesetter needed to lay out the atrributed string.")
}
}
else
{
print("Could not create the framesetter needed to lay out the atrributed string.")
}
}
// 使用 Core Text 在页面上的框架中绘制文本。
func renderPage(_ pageNum: Int, withTextRange currentRange: CFRange, andFramesetter framesetter: CTFramesetter?) -> CFRange {
var currentRangeIn:CFRange
let currentContext = UIGraphicsGetCurrentContext()
currentContext?.textMatrix = .identity
let frameRect = CGRect(x: 72, y: 72, width: 468, height: 648)
let framePath = CGMutablePath()
framePath.addRect(frameRect, transform: .identity)
let frameRef = CTFramesetterCreateFrame(framesetter!, currentRange, framePath, nil)
currentContext?.translateBy(x: 0, y: 792)
currentContext?.scaleBy(x: 1.0, y: -1.0)
CTFrameDraw(frameRef, currentContext!)
currentRangeIn = currentRange
currentRangeIn = CTFrameGetVisibleStringRange(frameRef)
currentRangeIn.location += currentRange2.length
currentRangeIn.length = 0
return currentRangeIn
}
//在底部绘制页面编号
func drawPageNumber(_ pageNum: Int) {
let pageString = "Page \(pageNum)"
let theFont = UIFont.systemFont(ofSize: 12)
let maxSize = CGSize(width: 612, height: 72)
let pageStringSize: CGSize = pageString.size(withAttributes: [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 14.0)])
//let pageStringSize = pageString.size(with: theFont, constrainedTo: maxSize, lineBreakMode: [])
let stringRect = CGRect(x: (612.0 - pageStringSize.width) / 2.0, y: 720.0 + ((72.0 - pageStringSize.height) / 2.0), width: pageStringSize.width, height: pageStringSize.height)
pageString.draw(in: stringRect, withAttributes: [NSAttributedString.Key.font : theFont])
}
- Anshul Jain
0
//StartNewPage
UIGraphicsBeginPDFPageWithInfo(pageFrame, nil);
如果输入的文本超出页面框架设置，请查找TextView中的文本高度并调用此方法。PageFrame是PDF的新页面框架。
- Lithu T.V
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